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Revenues - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Disaggregation Of Revenue [Line Items]          
Subscription contracts term     1 year    
Revenues $ 4,977 $ 6,155 $ 14,858 $ 18,557  
Deferred costs expected period of benefit     30 months    
Unsatisfied performance obligation on subscription contract term     1 year    
Impairment losses related to costs capitalized 0 0 $ 0 $ 0  
Google [Member]          
Disaggregation Of Revenue [Line Items]          
Strategic agreement term, optional renewal term       1 year  
Revenues 1,788 $ 2,283 5,363 $ 6,849  
Accounts receivable $ 1,788   $ 1,788   $ 1,788
Google [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Disaggregation Of Revenue [Line Items]          
Percentage of concentration risk     42.00%   39.00%
Maximum [Member]          
Disaggregation Of Revenue [Line Items]          
Subscription contracts term     2 years    
Advance advertiser invoicing period     12 months    
Minimum [Member]          
Disaggregation Of Revenue [Line Items]          
Advance advertiser invoicing period     3 months    
Subscription remaining performance obligations expected duration     1 year